The ones set forth in 2.2b obviously, which you have inexplicably declared to be "nothing."
Stormy's defense (not Trump's, that is silly) to the the enforceability of the contract is that it wasn't signed, and I can tell you that given that she accepted the money and the other two parties acted in conformity with the agreement you are quite correct that "The law just doesn't favor it being a winning defense."
The penalty clause ain't the most important, the confidential arbitration clause is for reasons that should be obvious.
By the way? This? "But, by all means, keep disagreeing with two lawyers. It's really working out for you." That is what I hear tell is called Danth's law, right there. And as such, perhaps it isn't going as bad for me as you think?